Escapement mechanism.



0. MOCANN. EBUPENENT IEOHANIBI.

uruonxol umm un. 1e, xm.

1,007,220. Patented occ.31,19r1.

har-1. 1

45 the esca ement mechanism.

UNirED sTA'ijns PAfinNr OFFICE.

OWEN IQGANN. F LOUISVILLE, RENTUOXY.

ESGAPEHENT HECHANIBH.

subject of the n'escnt invention is designed more partcula y for controlling the movenient of the carriage of tvpcwriters uml other machines, and it has for itsobjcct to Lirovide an improved mechanism of this 1'5 ind whereby a variable feed of the carriage may be obtained.

n the accompanying drawing forming a part of this apeeitication---Figuri` 1 is a perspective view showing the application of the invention. Fig. 2 is a Plan view partly in section, ot' a portion o the meciauism.

,l"ig. 3 is a cross seetion on the line 3-3 of Fig. 2. Fig. 4 is a sectional detail.

cferring specifically to the drawing. 5

26 denotes the feed rack of a carriage (not shown). 'lhe carriage is fed forwardly by any suitable means, its movenwi'itbeing controlled bythe esca peinent mechanism coopcratin' with the feed rack.

licneati the feed rack incluse proxiliiity thereto, is lociitcd a bracket (t uiadc fast in any suitable iuaiuier to the frame of lthe machine. At the ends of this bracket, are bearings 7 aiul H which sup Jort n shaft.

ati t) extending parallel to tho feet rack. Un

' this shaft is iliade fast a sleeve 10 which is formed at one of its ends with an outstanding scini-circular flangel 11 having a ,beveled edge, said flange forming one of the teeth of the escapeiucnt mechanism. On the sleeve 10 is loosely mounted a sleeve 1i. having at one of its ends an outstanding scmi-circular flange 13 which also luis a beveled edge and forms the other tooth of A short distance be iind the flange 13 the sleeve 1'. is enlarged -to form a shoulder 14 between which nml the bearing 7 a spring 15 is coiled around said sleeve. lhe flanges 11 and I3 are normally side by side in alincnient., alid in contact with euch other, in which position they forni a circular flange. The sleeve lpeotaoattoli et Letten Patent. Appileatfoa tiled )tai-nti 18, 1911. lei'fal llo. 014,827.

Patented Oct. 31, 10171.

thereto, andas the flange 11 is integral with said sleeve it rotates therewith. Rotation of the flange 11 also rotates the flan vc 13 when it is in contact therewith, this he its normal position as already descri lletwecn the flanges 11 and 13, and the bearing 8, the shaft 0 carries a collar 1Q having at its end which is opposite tho flange 13 a stepped piece 17. At the other cud of the collar is'a sleeve 18 which is supported in the bearing 8. The sleeve 18 projects a short distance from the bearing; 8 and carries a cross pin 10 to one cn` of which is attached a coiled spring 20 iliade fast to thebcaring 8, said spring noriniill holding the pin 1t) against a stop 21, whic i determines the normal position of -g. the ste pcd member.

t 22 are indicated several spacing keys which are carried by levers 229 l"alcruined to a fixed pai-tof the machine. Beneath these levers is located a yoke 24 also fulcruined to sonic fixed part of the machine. The front bar of the.yoke has a series of steps 21S corresponding in number tothe number of levers 23, these steps being directly beneath the respective levers. Inasniuch'as the yoke is not actuated until it isei'igagcd by the levers, it will be scenthat the extent of the swiu' of the yoke is variable. 'lhe key 10 rotates with the shaft t) as itis made fast l whici is above the lowest step imparts l minimum swing to the yoke, and thc key which is iibove thc highest step imparts va maximum swing to the voke. lhe number of keys corresponds to thc number of steps on the member 17.

One of the side pieces of the yoke 24 has an angular extensionzti which is connected by a pitman 27 to a crank 28 fastened to one end of the shaft 9, whereby said shaft is rocked when the yoke is depressed by the engagement of any one of the. key levers 23 therewith. A suitable restoring spring,

'for returning the parts to their normal -position when the key levers are released, is

provided.

The o )eration of the escnpcment is as follows: 'lie vtooth 13 is normally in engagement with the feed rack 5. 'lo fccd the carriage, one of thc key lcicrs 2,3. according t0 thcl niinibci' of spaces it is desired that the carriagentove, ts depressed whereupon, throngh the yoke 24 aml the eonneetion thereof with the shaft 9, tite latter is roeked. The teeth 11 and 13 partake of this movement ofthe shaft whit-lt is in a direction to disengage tbetooth 13 from the feet raek nml to engage the tooth 1l therewith. 'lhe tooth 13 now being free, it is shot 'forwardly by the spring 'l5 until it is lstopped by one 0 of the steps of the member li'. said member reptaining statidniir'il during the herein deseribed rocking movement of the shaft 9. The key lever is now released nml the restoring spring returns the mrts to their 't tornal position. .During his movement the shaft t) is rocked in the o iposite' direction from that ,first deseribetll. wheren on the tooth 1l is disengaged from the `eed rack and the tooth 13 is again engaged therewith. '.lhe'earriage is now pulled forwardly by a weight. spring. or other aetna'ting means. the tooth t3 being earried along b v the feed raek and stopping the eat-ringe when it comes boek to its normal position beside the tooth ll. The. tooth is stopped in thc last deseribed position b v the en 'ageontA of' the end of the sleeve 'l2 witlithe tearing l. 'lhe earriage thas travels forwardlv tbe distanee the tooth lt was plat'ed ttbemlef the tooth4 ll. 'lhe stepped titelliber l? determines this distance. tbe particular step whieh tbe.tooth lil engages depending on the extent of the rotar v movement of tho shaft 9. wltieh in turn is enntrolled bv the key levers nml the stepped yoke. T te key lever seleeted therefore. determines the nu'mher -of spat-es the earriage is movell forwardly. Thus. if tbe key lever which imparts a maximum swing to the volw is seleeted. the shaft is rotated a distanee to plaee the sliding tootn lil in alinement with the step of the member li' whieh is farthest from the tooth Il. Il v thas se. leeting the ker levers a variable feed of the earriage is etl'eeted. lhe movement of the teeth is transverselv of the feed rat-lt. aml one tooth does not leave the feed raek tlntil the other tooth engages the same. so that the earriage is always maler eonti'ol. When the tooth lil slides a\va` v frotn the member l? bnek to it. nortnul position hesitlotho tooth ll. it slips down the steps eansing the member to turn on the shaft t) against the tension of the .spring .'tb nml wh'en tln` tooth elears the member. the latter is restored to its normal position against the stop :tl by said spring.

ln order to prevent the momentum of the l\e v levers. from eartving the .sha ft tt and "the parts mounted thereon too far. a dash: pot :ttl is provided in whirh wot-lcs a plnngtfl' Ill having its .stem il'.' eonneeled to the e\' tension' '."i of the volte l. 'l`he. dashpol has n volte 2*.2; to allow :tir to enter freelv nml also anutdjustable' vent 34 to allow eseape of the nir when the phmger is moving inwardly.

lelailn: i

l. ln an eseapement mechanism, a feed rat-lc, holding memlairs alternately engageable with the raelt. one of saithtnembers normally engaging tbe raekfand being slidable in the direetion of the length thereof when disengaged therefrom and in the opposite direetion upon again engaging the same, steps to litnit. the slit-line' movement. of the holding men-dier, one o Isaid stops having port ions whieh are spaeetl different distant-ps from the other stop to determine the extent of the first-mentioned movement of the sliding member, and means for imparting a variable rotary movement to the slidingmember to plaee the .same in olinement wit a seleeted spaeed portion of the stop.

2. ln an eseapement mechanism, a feed rat-lc. a rotatable shaft extendin parallel to the raek, a .sleeve mounted on t e shaft and rotatable. therewith, .said sleeve having a tooth adapted to engage the rack, a sleeve slidably moanted on the tiret-mentioned sleeve aml rotatable therewith, maid secondlnentioned lsleete having a tooth normally engaging the raek, a `atop member having portions wbieh are spared ditl'erent distances from the seeoml-mentioned tooth, and means for itnparting a variable rotary movement to the shaft to alternately 'engage the teeth with aml to disengage the same from the raek. the disengagement of tlie setiond-menfoo Iioned tooth frotn tho raek being accom panied hv the alinement of said tooth with a seleeted portion of the stop. I

Il. ln an esea|wment mwhaniannea feed raek. holding memlwrs alternately engage ,.|,05

able with the raek. oae.of said members nor' mall v engaging the niek. aml being slidable' in the direetioa of the length thereof when disengaged therefrotn and. in the opposite diret-tion upon again engaging the same, 11i

`tops to limit .the sliding movement of the 'helding member. one of said stops having portions whieh are spared ditlerent distanees from tbe other stop to determine the extent of the lirst-ulentiom-d movement. of 11.3

the sliding member. uml means for imparting a variable rotary movement to the sliding member to plaee the same in alinement. with a seleeted spaeed portion of the stop,

.-aid means inelnding a pivoted member hav 1`2t.

ing a stepped portion.. uml key levers lot-ated' above the steps of said pivoted member.

l. ln an eseapement meehatsism, a feed raelt. a rotatable shaft extending parallel to the ravk. a sleeve mounted on the shaft 12l.

nml 'rotatable therewith. said sleeve having a tooth adapted to engage the rack, n sleeve islidably mounted on the tirst-tnenlioned sleeve nml rotatable. thertnvitb. said second-- lil' 66 when the plonger i. being drawn outwardly. t mentioned sleeve having a tooth normally 130 engaging the rack, s stop member having l comprising s pivoted member operatively portions which are spaced different dxsconnected to the shaftsnd having a. stepped tonces from the second mentioned tooth," portion and key levers located above the f means for importing n vsrmble rotary moveste s of said pivoted member.

E 6 ment to the shaft to alternately engage the n testimon whereof I ailix my signature 16 teeth with and to disengnge the some from in presence o two witnesses.

l the ruck, the disengagement of the second- OWEN McCANN.

mentioned tooth .from the rack being sccom- Witnesses: psnied b the slxnement of smid tooth with Lu: Smcxnuoxn, l0 s select portion of the stop, said means J. W. WAYNE. 

